Automatic firearm with a movable barrel



Feb. 12, 1935. Ri VON FROMMER 1,991,302

AUTOMATIC FIREARM WITH A MOVABLE BARREL Filed Maron 19. 1932 Vw yVMW/er gf.' 07m/49%@ AUTOMATIC FIREARM WITH A YMovAnLn x v BARREL Rudolf von Frommer, Budapest, Hungary v Application March 19, isaaserial'No. 599,957' In Hungary MarchZl, 1931 1 claim. (ci. 42-4) In my Patent No. 1.574,770 of March 2, 1926 an operating handle for automatic fire arms actuated also manually is described, which is swingably connected to the breech bolt and coopervates with a coupling member, which couples and uncouples the handle with a part of the Vfire arm and especially with the closing spring of the breech bolt, for the purpose that when opening the breech boltby hand the operator is not compelled to stretch the closing spring.

In the use of fire arms with a movable barrel and fitted with such a handle some disadvantages occur. When the re arm is actuated manually, the discharged cartridge case must be pulled out from the loading chamber of the barrel by opening the breech-block. Now when a cartridge case isjammed in the loading chamber of the barrel,I on drawing back the Vbreech bolt, the

i ing device.

barrel is taken along with the latter without opening the Vbreech-block. The present invention has for its object to avoid this inconvenience by fixingthe barrel automatically when opening the breech-block manually by the said swingable handle, so that the breech-block is openedy on the withdrawal of the breech bolt, which pulls the cartridge case out of the chamber.

Inthe accompanying drawing one form ofthe invention is shown by way of example.

Fig. 1,is a top plan View of one part of the re, arm the xirig device being disengaged. f Fig. 2, is a similar view withthe engaged nx- Fig. 3 is a cross section taken on line 3-3 of Fig. 1.

" Fig. 4 is a cross section taken 4on line of .Fig 2. f

A two armedv i versely'of the axis of the barrel and can be swung ashoulder 7 and on the otherV one a projection 6.

fixing lever 3 is arranged trans- 'Ihe nose 11 of the coupling arm or hook 12, which is under the action of a spring 8 and pivotally mounted on the pivot 9, bears upon the shoulder 'i' of the lever l3, said arm 12 being moved by the operating handle 10. When the breach is fully closed that is, to say it occupies its normal position (see Fig. 1) the nose 11 presses under the action of theV spring 8 the xing lever 3 into its disengaged position (see Fig. `1%) the spring 8 being considerably stronger than the spring v5.* In-this state the barrel ispfreelymovable and when the vlire arm functions automatically, the backward shifting of said barrel is unrestrained. But if the re arm is operated manually and the operating .A

handle l is caught by theoperator in order to withdraw the breech bolt by means ofv the latter, thehandle 10 is instantly swung back, whereby the coupling arm 12 will be swung around the pivot'9 against the action of the spring 8. Thereby the ynose 11 is removed from the shoulder 7 of the fixing lever 3, so that the spring presses positively the projection 6 of the fixing lever 3 into the recess 2 of the barrel (see Figs. 2 and 4) whereby the barrel is xed. If the operating handle at the closing of the breech is pushed forward again, the nose l1 again presses back the shoulder '7 of the fixing lever 3, whereby the barrel is released again and can be freely moved backwards.

I claim: i

In an automatic re arm, a movable barrel having a recess therein, a breech bolt, a handle swingably connectedto the breech bolt, a coupling arm moved by the said handle, a fixing member for the barrel, a spring adapted to push the said fixing member into the recess ofthe barrel to fix the barrel,` a spring adapted to pushvsaid coupling arm toward said xing member in the closed po-V sition of the breech bolt to hold the fixing member disengaged from the recess of the barrel. 

